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Subject (Era)
- 20th century24
- 21st century11
- Civil War, 1861-18658
- 19th century7
- Colonial period, ca. 1600-17754
- 1870-19453
- To 332 B.C.3
- 1783-18652
- 17th century2
- 1800-18702
- 1845-18612
- 1861-18652
- 1865-2
- 1900 - 19992
- 1961-19632
- 1991-2
- 1994-2
- Eighteenth dynasty, ca. 1570-1320 B.C.2
- Qin dynasty, 221-207 B.C.2
- Qin-Han dynasties, 221 B.C.-220 A.D.2